HEATING SCARF — USB port with a hidden zippered pocket and button to control the heating degrees. Powered by USB, you could also connect it into wall charger, laptop, computer, car charging port etc. The input voltage is only 5V, which is absolutely safe and reliable. FAST HEATING — Semiconductor heating safety after pressing the switch for 3 seconds. DURABLE AND REUSABLE — Heated scarf rechargeable could warm you up in minutes, the heating temperature range is from 86-140 degree